This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL outputs. The circuit can be adapted to function as a shield.
Found in American documentation from the 1970s, this circuit employs an integrated circuit from...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This assembly circuit using a small motor as a generator was found in Radio Electroics magazine from...